Finding the Third Proportional to 99,642 and 216,779.25

Step by Step Solution

1. Step 1: Write the proportion equation
   99,642 : 216,779.25 = 216,779.25 : x
2. Step 2: Convert to fraction form
   99,642/216,779.25 = 216,779.25/x
3. Step 3: Cross multiply
   99,642x = 216,779.25 × 216,779.25
4. Step 4: Simplify right side
   99,642x = 46,993,243,230.56
5. Step 5: Solve for x
   x = 46,993,243,230.56/99,642
6. Step 6: Final answer
   x = 471,620.83